Carbureter.



1. W. T. CADETT.

CARBURETER.

APPLICATION FILED IuLY 23, Isla.

1,165,224. Patented Dec. 21, 1915.

CULUMBIA PLANDIIIRAPH C0.. WASHINGTON, D, E.

nnrrnn sfrarns N rx'rnivr orrron JAMES WILLIAM '.lII-lOlVlIJSl CADETT, 0F ASHTEAD, ENGLAND.

CARBURE'IER.

Application filed July 23, 1913.

p To all whom t 'may concern.'

Be it known that I JAMES WILLIAM 7 THOMAS CADnTT, a subject of the King of Great Britain residm at Ashtead Surrev. 7 v England, have invented neu7 and useful Improvements Relating to Carbureters for Internal-Combustion Engines, of which the following is a specification.

This invention relates to carbureters of the type in which thevpetrol jet, when onceciently spraying the liquid fuel or the mixture of air and fuel passing to the engine, especially in the condition where partial throttling of the mixture of air and fuel is taking place.

According to my invention, the fuel nozzle or petrol jet is arranged in an air-duct through which the whole cf the air supplied to the carbureter passes, the fuel nozzle being at such a distance from'the throttle that the suction at the jet is not materially` influenced by the proximity of the throttle opening. By this it is meant that, for any amount of air passing through the airduct in unit time according to the opening of the throttle, the velocity of the airpassing the petrol jet is materially that of this amount of air passing the jet in the said air duct of fixed dimensions in the same time.v `Were the throttle too close to the jet,'the inc'reas'4 ing velocity of the air approaching the throttle opening, especially in the partially or nearly closed positionJ would render the suction at the nozzle greater than the value corresponding to the degree of throttle-opening. From the nozzle arranged at such aposition that the suction at the jet is not materially influenced by the proximity of the throttle opening the fuel is carried to the throttle-opening, where the velocity of the air is a maximum and consequently the spraying is most active, by means of a conveying device, such as a conical needle, rod or the like, leading to said throttle-opening, forexample from the needle of a needlevalve controlling the outlet of fuel at said nozzle. In general practice the length of such conveying needle or rod, for a 20 to 40 specication of Letters Patent.

Patented Dec. 21, 1915.

serial No. 780,789. i

H. engine, may he in., but considerable variations may be made according tol the size of the carbureter. In order that thev said conveying device shall always conduct the fuel to the point at whichy the spray-ing is most active, a throttling device is employed of the kind known per se, wherein the place at which the throttling is most active does not alter its position during adjustment of the throttle; for example, it may consist of two notched plates movable toward and away from each other, or of an iris-diaphragm throttle, or the like. It is preferred to use one nozzle for conveying fuel into the carbureter. Several nozzles may, however, be used if required. Instead of an extension of the adjusting needle, a device'not connected to the adjusting needle may be provided, for instance, a fine wire or wires or a capillary tube or tubes extending from the jet to the throttle. All that is requisite is that the conveying device should extend from the center of the throttle or from a point proximate thereto into or sufficiently close to the jet so that the liquid fuel can wet such device or make contact with it. I may provide a main air inlet valve preferably of the gravity type or a valve controlled by a spring or dashepot or'both on the Vside 'of the jet away from the engine. Both of these forms of air inlet valve are known per se. l

Figures 1 and 2 of the accompanying drawings show in plan and sectional elevation respectively a diagrammatic representation of an embodiment of my invention. Fig. 3.is a sectional elevation illustrating two modifications. Figs. 4L and 5 are plan views of the two modifications to which the elevation in Fig. 3 is common.

An extension a on the adjusting needle Z) of the jet o from the float chamber or other constant level device is arranged to extend from the jet orifice to the center of the throttle opening. The throttle which I prefer to employ is of the sliding plate type and consists essentially of two plates Le provided with extensions f, g whereon rack teeth f', g are cut so as to mesh with the throttle control pinion z.. It will be seen that rotation of the pinion causes the plates to move in opposite directions, so that holes i', j, formed therein may be brought into coincidence to give full throttle opening or moved so as to overlap more or less to give varying grades of closed throttle and that plates and the separate top plate p alll pressed up against the outer cover g.

By the above I provide directing or conveying means for carrying the .liquid fuel from the orifice of the spray jet into the` region or position in which spraying can be eected most actively and this Without alter-v ation to the velocity (and hence to the suction effect) of the air iiowing past the spray Jet. i

In a modification illustrated in Fig. 3 I have shown a group of thin rods or capillary tubes r in lieu of the single rod a. in Figs. 1 and 2. These rods or capillary tubes are supported independently of the needle b for example by means of a cross bar s. In the case of capillary tubes they must be at such a distance from the jet aperture as to prevent any suction through the capillary. tubes from materially affecting the suction in the spaceV around the jet which space is of fixed dimensions. The capillary tubes 7.

are shown in plan in Fig. 4, and the rods 7" in Fig. 5.

In .the case where a jet is used of definite or suitable size and not provided with a regulating needle forv initial setting, the directive' device may be lbroughtvfrom the throttle opening and extended sufficiently close to thejet, as shown in Fig. 3, so that with the minimum suction required the liquid fuel will make contact with the needle Copies of this patent may be obtained for five cents each, by'addressing the Commissioner of Patents,

and be conveyed by capillary attraction or surface tension or attraction to the throttle opening. The throttleopening is placed at such a distance from the jet as is found not to materiallyinfluence the suction at the j et.

If too far away the liquid fuel would not all be carried into the throttle opening by the extension of they needle when the throttle is nearly closed and the engine working very slowly. The best distance is found by trial,

lthe vrange of suitable distance varying acdistance as it can be varied considerably without departing from the essential feature l of this invention. v

What I claim is:

A spray carbureter kfor internal combusstion engines, comprlsing 1n combination, aV

casing having a single air-duct of fixed di-Il i mensions through which passesthe whole of" the air supplied to the carbureter, a nozzlearranged in said air duct, a throttle forthe mixture of air and fuel, said throttle and the Walls of said air-duct being arranged at such a Vdistance from the nozzle that the suctionat the et is not materially iniiuenced by the proximity of the throttle opening,

the opening and closing of vwhichvthrottle proceeds in such a way-that the center of opening is at the same point in all 'positions yof throttling, and a fuel conveying devicewhich. extends from vthe nozzle to the center of said throttle opening for the purposel set forth. I

Witnesses: q Y

G. DONALD HARRISON, HERBERT I). JAMESON.

' Washington, D. C.

JAMES WILLIAM THQMASAGADETT. 

